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首页> 外文期刊>Bulletin of earthquake engineering >Influence of near-fault ground motion characteristics on the seismic response of cable-stayed bridges
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Influence of near-fault ground motion characteristics on the seismic response of cable-stayed bridges

机译：近断层地面运动特性对斜拉桥抗震反应的影响

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摘要

Observations from several earthquakes indicate that near-fault (NF) ground motions have a significant influence on the seismic response of structures. However, existing studies have only discussed the influence of a certain NF characteristic on the seismic response, rather than systematically discussing and comparing the influence of different NF characteristics. Furthermore, current research is only suitable for a specific structure while the influence of NF characteristics on structures with different dynamic characteristics has not been revealed. As an important lifeline project, the safety of a cable-stayed bridge (CSB) during earthquakes is of great concern. Therefore, this paper investigates the influence of NF ground motions on the seismic response of CSB. Firstly, three major characteristics (i.e., the hanging wall effect, rupture directivity effect and high velocity pulse) of NF ground motions are analyzed using NF records of the Chi-Chi earthquake. Secondly, a finite element (FEM) model for modeling a prototype CSB is developed and benchmarked. Then, the seismic responses of the prototype CSB subjected to NF ground motions with different characteristics are analyzed using the benchmarked FEM model. The analyses show that hanging wall effect, rupture directivity effect, and high velocity pulse affect the seismic demand of the CSB to varying degrees. Furthermore, the influences of NF characteristics on the displacement response of CSBs with different fundamental periods are investigated using SDOF systems. The analysis results show that different NF characteristics have various influences on the displacement response of CSBs with different fundamental periods.
机译：来自几次地震的观察表明，近断层（NF）地运动对结构的地震反应产生了重大影响。然而，现有研究仅讨论了某种NF特征对地震反应的影响，而不是系统地讨论和比较不同NF特性的影响。此外，目前的研究仅适用于特定结构，而NF特性对具有不同动态特性的结构的影响尚未被揭示。作为一个重要的生命线项目，地震期间的缆绳座桥（CSB）的安全性很大。因此，本文研究了NF地面运动对CSB的地震反应的影响。首先，使用NF地震的NF记录分析了NF地球运动的三个主要特征（即悬挂壁效应，破裂尺寸效应和高速脉冲）。其次，开发和基准建模用于建模原型CSB的有限元（FEM）模型。然后，使用基准的FEM模型分析对具有不同特征的NF接地运动的原型CSB的地震反应。分析表明，悬挂壁效应，破裂方向效应和高速脉冲影响CSB对不同程度的地震需求。此外，使用SDOF系统研究了NF特征对具有不同基本时期的CSB的位移响应的影响。分析结果表明，不同的NF特性对CSB具有不同基本时期的分离响应具有各种影响。

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